When I first saw the vehicle there was a lot of soot on, and around, the back of the car, which, in hindsight, probably said 'I'm running rich and you'll find that the bypass hose is split.' My '07 407 manual with RHR does not have the bypass hose nor does the wife's '10 308. Then sometime during these ailments the DPF sensor failed, and I don't know what it's failure would have done for regenning - but i do know that just changing it did create an immediate improvement to how the engine ran. It is theorised that in the past the intercooler bypass hose only had a small leak which would cause an underboost situation while the MAF told the ECU to supply fuel commensurate with what it knew and consequently the engine was constantly overfueling for the inlet air it was actually receiving and over time the DPF has become quite badly clogged. Though the engine runs OK now it will still, when pushed a bit hard, throw up the DPF icon which leads me to think that it may have to receive a forced regen. Morning JB405, The other day I found that the fuel cap was wounded so it was replaced, and in view of dcc236's comment of 16 Aug it seems that the faulty cap may have been adding to the original issues.
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